In order to obtain water-soluble polycaprolactam (PA6) with good surface activity,PA6 was modified with fatty alcohol polyoxyethylene phosphate.The effects of process conditions such as reactant mass ratio,reaction time and reaction temperature on the water solubility,viscosity,surface activity,contact angle and thermal stability of the product were studied.The optimum conditions for the synthesis of PA6 were obtained.The structure of the product was characterized by fourier transform infrared spectroscopy and nuclear magnetic resonance spectroscopy.The surface morphology of carbon fiber was characterized by field emission scanning electron microscope.The results showed that the thermal stability of the modified products was good under the optimum conditions.At 500℃,the residual rate of unmodified PA6 was almost completely decomposed,the residual rate of 8102PK was 24.12%,and the residual rate of 8102PPAK was 27.59%.The minimum surface tension is 22.6mN/m,and it has good surface activity.After sizing the carbon fibers with a 1Wt% emulsion,the contact angle between the carbon fibers and water reached 51.23°.Compared with 85° before modification,the hydrophilicity of the fiber surface was improved.When the sizing concentration and application amount were 1Wt% and 4mg/g,respectively,a uniform serous film was formed on the surface of carbon fiber.The fiber surface roughness was minimized,and the defects on the fiber surface were repaired.
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